Power, Rate and Hopping Adaptations in Hybrid DS/FH CDMA Communications over Slow Rayleigh Fading Channels

Ye Hoon LEE
Dong Ho KIM
Jaekwon KIM
Cheolwoo YOU

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.6    pp.1799-1806
Publication Date: 2006/06/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.6.1799
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
hybrid DS/FH,  adaptive systems,  Rayleigh fading,  

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We consider a hybrid direct-sequence frequency-hopped (DS/FH) code division multiple access (CDMA) communication system, where the transmission power, data rate (i.e. spreading gain), and hopping frequency are adapted relative to the channel variations. Instead of random frequency hopping, hopping pattern is adaptively adjusted to obtain the maximum channel gain among available frequency slots. Transmission power and/or data rate are also adapted such that a target transmission quality is maintained. It is shown that the proposed scheme provides a higher average data rate than pure DS/CDMA with power and rate adaptations, subject to the identical bandwidth and average transmission power constraints.